Dredger-dipper



UNITED STATES PATENT Orricn.

MANLEY C. LA\VTON, OF STATEN ISLAND, CALIFORNIA.

DREDGER-DIPPER.

SPECIFICATION forming part of Letters Patent No. 393,439, dated November27, 1888.

Application filed Juno 2, 185 8.

To all whom it may concern.-

Be it known that I, MANLEY O. LAWTON, of Staten Island, San Joaquincounty, State of California, have invented an Improvement inDredger'Dippers; and I hereby declare the following to be a full, clear,and exact description of the same.

My invention relates to that class ofdredgerdippers in which opposingjaws of the clamshell pattern are pivoted to a carrying-frame and areoperated by a sliding cross-head connection and pulleys and chains;andmy in vention consists in the constructions and combinations ofdevices which I shall hereinafter fully describe and claim.

Referring to the accompanying drawings, Figure l is a side elevation ofmy dredger-dipper. Fig. 2 is an end elevation of same.

A is the frame of the dipper, consisting of separated parallel sidesmade Wide near their lower ends.

B B are the jaws, of the usual clam-shell type. They are pivoted inparallel planes by the rods b b at the extremities of the frame A,closing to the center and opening out their full width beyond the sidesof the frame. The ordinary clam-shell dipper has its jaws pivoted on acommon shaft in the center of the frame, and they can therefore openonly to their own Width. The advantage of my present dipper is thatopening to such a width it has a greater cut and a freer dump.

Thejaws are operated by the following novel mechanism: To each side ofeach jaw, as shown at the points 0, are connected the links 0, the otherends of which are attached to a crosshead, D, which is mounted andadapted to move up and down in the slotted center bars, a, of the frameA. Mounted in the head of the frame is a rotary shaft, E, having uponits center and rigidly keyed to it a large chainpulley, F, to which themain hoistingchainf is attached. Fixed upon the shaft E beside the mainpulley F, or forming part of said pulley, if desirable, is a smallerchain-pulley, G, to which a chain, 9, is attached, but arranged to windin an opposite direction to that in which the chainf winds on itspulley. These two chains may be supposed to lead to the usual hoistingmechanism of the dredger, and which need not herein be described. Uponshaft E, near each side and just within the Serial No.275,808. (Nomodel.)

frame-sides, are rigidly fixed the chain-pulleys H, having a diameterequal to that of the pulley G. To these pulleys H are attached thechains h, which extend downwardly and are connected with the cross headD of the jawlinks 0. -Upon the shaft E and alongside of the pulley F arefixed two chain-pulleys, I, from which chains J pass down to and areconnected with arms K, extending from the back of the jaws. These chainswind upon their pulleys in a direction opposite to that in which thechains h wind on their pulleys H.

The operation is as follows: Supposing the jaws open, the chainf ishauled in, thereby rotating the shaft E. This winds up chain 9 on pulleyG. It also winds up chains h on pulleys H, and these chains being connected with cross-head D pull it up, and through the links 0 the jawsare brought together and closed. In this movement the chains J pay out.The leverage of the links is sufficient to exert the required power toclose the widely-separated jaws and take the load. To dump theload,thechainfis slacked np,thus throwing the weight on chain g,which,

through pulley G, turns shaft E back again,

thus paying out on chains h and allowing the cross-head to move downunder the weight of the load, separating the jaws. The chains J now act,for by the rotation of pulleys I with shaft Esaid chains are wound up,and pulling up on arms K complete the opening of the jaws, spreadingthem to their greatest extent or range.

I am aware of dippers having a number of approximately spherical sectorshung from a ring above or having their pivotal centers arrangedotherwise in a circle; but these dippers belong to a different class andtheir jaws are not pivoted in parallel planes.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a dredger dipper, and in combination with the carrying-frame, theopposing jaws B B, pivoted in parallel planes in the extremities of theframe, widthwise the links attached to the jaws, the movable cross-headmounted in the frame and connecting the links, the rotary shaft in theframe carrying the main pulley,with chain attached, a second pulley withoppositely-attached chain, and the side pulleys, with chains connectingthem with the movable cross-head, substantially as herein described.

2. In adredger-dipper, a carrying-frame and opposingjaws pivotedthereto, in combination with the links attached to the jaws, the m0vablecrosshead connecting the links, the rotary shaft having a main pulleywith connected chain, a pulley with oppositely connected chain, the sidepulleys with chains to the crosshead for lifting it, and the pulleysLwith chains to the jaws for opening them, substantially as hereindescribed.

3. In a dredgerdipper, a carryingframe and opposing jaws pivoted to saidframe, said jaws having arms projecting from their backs, in combinationwith the links attached to the jaws, the movable cross-head connectingthe links, the rotary shaft having a main pulley with connected chain, asecond pulley with oppositelyconnected chain, side pulleys with chainsto the cross-head for lifting it, and pulleys I, with chains J attachedto them and to the arms of the jaws for opening said jaws, substantiallyas herein described.

4. In a dredger-dipper, a frame having separated slotted sides and theopposing jaws B B, pivoted in parallel planes in the extremities of theframe-sides, said jaws having arms projecting from the backs, incombination with the links attached to the jaws, the movable crossheadconnecting the links and mounted in the slotted sides of the frame, therotary shaft having a main pulley with connected chain, a second pulleywith oppositelyc011- nected chain, side pulleys with chains to thecross-head for lifting it, and pulleys I, with chains J, connected withthem and with the arms of the jaws for opening said jaws, sub stantiallyas herein described.

In witness whereof I have hereunto set my hand.

MANLEY C. LAWTON.

\Vit ncsses:

S. H. NoURsn, if. 0. LEE.

